There are a lot of web-sites selling kind of e-books which, as it is said, contain different kind of betting systems that offer continuous winning at betting for different games like: tennis, football, etc.
Anybody heard of some?

it is difficult to do that, there is a lot of techniques which can not allow to trace these webpages' location. Anyway, just think, if the author of the book says you can win millions within 1 year, then why does he need to sell that book for 53$?

that's naively to believe in such a system. You see, everything here depend on odds, even if somebody discovers such a system, the odds will be changed to another trend and the bookmaking system will not anymore be available

If a kid asks where rain comes from, I think a cute thing to tell him is "God is crying." And if he asks why God is crying, another cute thing to tell him is "Probably because of something you did."

You can make money by betting through arbitrage. Arbitrage means the difference between the odds of different betting companies. So for example if one company may consider a player to be favourite, another may say he's the underdog

that's the point, that's the system. If it was so simple he wouldn't have sold it.
You know, everything I want is to hear that somebody bought this book and tell that this is not true, that's all!!!!!!!

...why I'm saying that, because I like playing tennis, and I play quite well. However sometimes I play with weak guys, who often happen to have edge balls that gives them points. Thereby they consider they are strong, but they're not.

I once had a software that decided who will win a hockey match, by scanning through multiple history data. But I can't say that it was a sure thing, and that is because the software did not know about the change in the team, what players were following which team, or what players were in the game during a specific match